EP0575783A1 - Electrical unit - Google Patents

Electrical unit Download PDF

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Publication number
EP0575783A1
EP0575783A1 EP93108813A EP93108813A EP0575783A1 EP 0575783 A1 EP0575783 A1 EP 0575783A1 EP 93108813 A EP93108813 A EP 93108813A EP 93108813 A EP93108813 A EP 93108813A EP 0575783 A1 EP0575783 A1 EP 0575783A1
Authority
EP
European Patent Office
Prior art keywords
spring arm
substrate
module according
electrical module
frame part
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP93108813A
Other languages
German (de)
French (fr)
Other versions
EP0575783B1 (en
Inventor
Kurt Fischer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vishay Electronic GmbH
Original Assignee
Roederstein Spezialfabriken fur Bauelemente Der Elektronik und Kondensatoren Der Starkstromtechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Roederstein Spezialfabriken fur Bauelemente Der Elektronik und Kondensatoren Der Starkstromtechnik GmbH filed Critical Roederstein Spezialfabriken fur Bauelemente Der Elektronik und Kondensatoren Der Starkstromtechnik GmbH
Publication of EP0575783A1 publication Critical patent/EP0575783A1/en
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Publication of EP0575783B1 publication Critical patent/EP0575783B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
    • H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H02H5/041—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature additionally responsive to excess current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
    • H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
    • H01H2037/762—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit using a spring for opening the circuit when the fusible element melts
    • H01H2037/763—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit using a spring for opening the circuit when the fusible element melts the spring being a blade spring
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/048—Fuse resistors
    • H01H2085/0483—Fuse resistors with temperature dependent resistor, e.g. thermistor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/36—Means for applying mechanical tension to fusible member

Definitions

  • the invention relates to an electrical component according to the preamble of patent claim 1.
  • the PTC resistors perform a reversible protective function in that the circuit in question is switched to high resistance in the event of a fault and then automatically switched back to low resistance.
  • a load limit specified by the PTC resistor If this load limit is exceeded, not only must a complete destruction of the PTC resistor be expected, there is always the risk that other parts of the module, including the printed circuit board on which it is mounted, may also be damaged as a result of the PTC resistor burning .
  • an electrical module in which instead of a PTC resistor, a thermal overload protection is provided, which consists of a pre-stressed U-shaped or V-shaped bracket, which is fixed to the substrate via its web and its legs are soldered at the free end to a contact surface of the substrate.
  • a thermal overload protection which consists of a pre-stressed U-shaped or V-shaped bracket, which is fixed to the substrate via its web and its legs are soldered at the free end to a contact surface of the substrate.
  • the aim of the invention is to provide a further electrical module of the type mentioned in the introduction.
  • the PTC resistor is connected to the circuit via at least one connecting element comprising a thermal overload fuse, the thermal overload fuse which can be fixed on the substrate or on the PTC resistor having at least one spring arm which can be soldered under pre-tension to a contact point of the PTC resistor or the substrate.
  • the PTC resistor on the one hand and the substrate and the circuit parts applied to it on the other hand because of the avoidance of a fire risk due to destruction of the PTC resistor are reliably protected , if exceptionally high loads occur that would normally lead to the complete destruction of the PTC resistor or an associated thick film resistor.
  • the thermal overload protection which also serves in particular to protect the PTC resistor, must therefore be designed in such a way that the PTC resistor on the one hand in the event of extreme accidents, i.e. before it is completely destroyed by erosion, it is switched off and, on the other hand, can operate in normal switching mode under loads which are not critical with regard to destruction of the PTC thermistor. It is particularly advantageous here that the thermal overload fuse does not respond, for example, to those voltage peaks which are harmless to the PTC resistor.
  • a thick-film module 10 which comprises a plurality of circuit parts arranged on a substrate 12, including a PTC resistor 14 which is connected via a connecting element 16 to an associated circuit which is connected via the PTC resistor 14 can be switched as high-resistance or low-resistance depending on the temperature.
  • the disc-shaped PTC resistor 14 is fixed by an electrically conductive silicone adhesive on the substrate 12 or a conductive surface attached to it.
  • connection element 16 comprises an integrated thermal overload fuse 18 with a contact-making spring arm 28, which in the assembled state is soldered to a contact point 30 on an electrically and thermally conductive plate 20, which is in the area 72 by electrically conductive adhesive on the relevant end face of the PTC -Resistor 14 is fixed.
  • the thermal plate 20 extends over the side edge of the disc-like PTC resistor 14 and has at the free end facing the substrate 12, the contact point 30, between which and the substrate 12, the thermal overload fuse 18 is arranged.
  • the connecting element 16 comprising the thermal overload fuse 18 and the heat conducting plate 20 initially consists of a uniform stamped part with two lateral holding strips 66, 68, the thermal overload fuse 18 is initially connected to the holding strip 66 via a web 74 and the heat-conducting plate 20 is initially connected to the holding strip 68 via a web 70.
  • the thermal overload fuse 18 comprises an essentially flat, U-shaped frame part 22, 24, 26 and an exposed central tongue connected to the central web 22 thereof, which forms the spring arm 28 and which, in the relaxed state, lies at least essentially in the frame plane (see FIGS. 3 and 5).
  • the central web 22 of the U-shaped frame part 22, 24, 26 fixed on the substrate 12 via its two legs 24, 26 has a small distance d from the substrate 12 when the spring arm 28 is relaxed and is in the region 76 of the spring arm 28 connected to it buckled or embossed that the spring arm 28 is held with its free end 36 against the substrate 12 to achieve a slight bias (see. Fig. 3 and 5).
  • the central web 22 is pulled toward the substrate 12, as is shown, for example, in FIGS. 2 and 6.
  • the spring arm 28 is supported with its end 82 adjacent to the central web 22 flat on the substrate 12, which is achieved by a special fold line 84 in this area of the spring arm (FIGS. 2 and 6).
  • the U-shaped frame part 22, 24, 26 is again, for example, by means of an electrically conductive part of the two legs 24, 26 shown hatched in FIG. 1 Adhesive fixed on the substrate 12.
  • the spring arm 28 is tensioned in that its free end 36 is lifted up out of the frame plane. In this tensioned state, the spring arm 28 is initially held by two support arms 32, 34, these support arms 32, 34 at the earliest after the spring arm 28 has been soldered to the contact point 30 of the heat-conducting plate 20, but preferably only after the connection element 16 has been mounted on the substrate 12 as well as on the PTC resistor 14 can be removed from the spring arm 28 again, as is indicated in FIG. 2 by the broken line 34 'of the one support arm.
  • the two support arms 32, 34 are provided on the free ends of the two legs 24, 26 of the U-shaped frame part 22, 24, 26 and each have a transverse score line 50 or 52 for supporting the spring arm 28 in its tensioned position bendable upwards.
  • the support arms 32, 34 are preferably on these score lines 50, 52, for example by repeated bending of the legs 24, 26 of the U-shaped frame 22, 24, 26 separable.
  • the thermal overload fuse 18 is already ready for operation as soon as the free end 36 of the spring arm 28 is released by the support arms 32, 34 and the tensioned spring arm 28 is only held on the heat-conducting plate 20 via the relevant solder joint.
  • the spring arm 28 In order to enable the spring arm 28 to be supported by the support arms 32, 34, it expediently has a laterally widened section 42 provided with a bead 40 or the like, in the recess 44 of which laterally with the spring arm 28 stretched over the support arms 32, 34 engage the support arms 32, 34 projecting support tabs 46, 48 (see. In particular Fig. 2 and 4 to 6).
  • the free end 36 of the spring arm 28 is bent in such a way that it rests flat against the associated contact point 30 of the heat-conducting plate 20 when the spring arm 28 is tensioned.
  • the parts of the connecting element 16 comprising the thermal overload fuse 18 and the heat-conducting plate 20 that are not to be bent or bent are at least partially provided with stiffening elements 54-64 in the form of embossments and / or laterally angled stiffening walls.
  • stiffening elements 54-64 in the form of embossments and / or laterally angled stiffening walls.
  • the legs 24, 26 of the U-shaped frame part 22, 24, 26 have stiffening walls 58, 60 bent upwards on the sections fixed to the substrate 12 on the inner longitudinal sides.
  • the support arms 32, 34 are provided with longitudinal stiffening grooves 54, 56 in the form of embossments.
  • the heat-conducting plate 20 has three longitudinal 62 and, in the area of the web 70, a transverse stiffening element 64, which in turn was obtained by stiffening grooves in the form of embossments.
  • the U-shaped frame part 22, 24, 26, the spring arm 28, the support arms 32, 34 and the heat-conducting plate 20 are expediently made of brushed spring bronze and are nickel-plated in matt and tin-plated in the areas shown in dotted lines in FIG. 4.
  • the individual steps for producing the connecting element 16 comprising the thermal overload fuse 18 and the heat conducting plate 20 from a single stamped part result from FIGS. 4 to 6, after the stamping and embossing and the separation of the thermal overload fuse from the heat-conducting plate (FIG. 4), the spring arm 28 serving as a contact tongue is formed, the bead 40 serving to support it is formed, and the embossing 76 used to produce a slight pretension is carried out (FIG. 5).
  • solder layer is applied in an area 78 on the underside of the stamped part.
  • the left stamped part having the heat-conducting plate 20 is then angled in the region of the two ends of the web 70 in such a way that the heat-conducting plate 20 is at a distance D from the holding strip 68, which is parallel to the latter and which is at least substantially equal to the height of the on the Substrate 12 to be applied PTC resistor 14 is. Furthermore, the spring arm 28 is tensioned and held in the tensioned position by the upwardly bent support arms 32, 34. Thereafter, the heat conducting plate 20 and the thermal overload fuse 18 are joined together and soldered to one another at the contact point 30. The connection elements obtained in this way thus form a taped arrangement.
  • connection element is preferably gripped in an area 80 of the heat-conducting plate 20 (FIG. 1) by the insertion tool and placed on the substrate 12 or the PTC resistor.
  • the support arms 32, 34 are bent downward away from the contact point 30, as is indicated in FIG. 2, for example, with the aid of the support arm 34 'shown in broken lines, and preferably by repeated bending on the score lines 50, 52 from the legs 24, 26 separated (Fig. 4).
  • the thick-film module 10 can in particular be designed as specified in DE 41 43 095.

Abstract

An electrical module (10) is described having circuit parts which are arranged on a substrate (12) and comprise at least one PTC thermistor (14). The PTC thermistor (14) is connected to a circuit via a connecting element (16) which grips a heat-overload protection device (fuse) (18), the heat-overload protection device (18) which can be fixed on the substrate (12) having at least one spring arm (28) which can be soldered in a prestressed manner to a contact point (30) on the PTC thermistor (14). <IMAGE>

Description

Die Erfindung betrifft einen elektrischen Baustein gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to an electrical component according to the preamble of patent claim 1.

Bei einem elektrischen Baustein dieser Art (GB 2 147 480 A) erfüllen die PTC-Widerstände eine reversible Schutzfunktion, indem der betreffende Stromkreis bei einer auftretenden Störung hochohmig und anschließend automatisch wieder niederohmig geschaltet wird. Ein solcher Schutz ist jedoch nur gegenüber solchen Störungen gegeben, die eine durch den PTC-Widerstand vorgegebene Belastungsgrenze nicht überschreiten. Bei Überschreiten dieser Belastungsgrenze muß nicht nur mit einer vollständigen Zerstörung des PTC-Widerstandes gerechnet werden, es besteht auch stets die Gefahr, daß infolge eines Abbrandes des PTC-Widerstandes auch andere Teile des Bausteins einschließlich der Leiterplatte, auf dem er montiert ist, beschädigt werden.In the case of an electrical component of this type (GB 2 147 480 A), the PTC resistors perform a reversible protective function in that the circuit in question is switched to high resistance in the event of a fault and then automatically switched back to low resistance. However, such protection is only provided against faults that do not exceed a load limit specified by the PTC resistor. If this load limit is exceeded, not only must a complete destruction of the PTC resistor be expected, there is always the risk that other parts of the module, including the printed circuit board on which it is mounted, may also be damaged as a result of the PTC resistor burning .

Aus der EP 0 352 771 A2 ist ein elektrischer Baustein bekannt, bei dem anstelle eines PTC-Widerstandes eine Wärmeüberlastsicherung vorgesehen ist, die aus einem vorgespannten U- oder V-förmigen Bügel besteht, der über seinen Steg auf dem Substrat fixiert ist und dessen Schenkel am freien Ende jeweils mit einer Kontaktfläche des Substrats verlötet sind. Sobald das Lot infolge einer thermischen Überlastung erweicht, wird wenigstens einer der beiden Schenkel aufgrund der Vorspannung von der betreffenden Kontaktstelle wegbewegt, wodurch der betreffende Stromkreis unterbrochen wird. Nach einer jeweiligen Störung muß somit die Sicherung stets von neuem installiert werden.From EP 0 352 771 A2 an electrical module is known, in which instead of a PTC resistor, a thermal overload protection is provided, which consists of a pre-stressed U-shaped or V-shaped bracket, which is fixed to the substrate via its web and its legs are soldered at the free end to a contact surface of the substrate. As soon as the solder softens as a result of a thermal overload, at least one of the two legs is moved away from the contact point in question due to the pretension, as a result of which the circuit in question is interrupted. After a fault, the fuse must always be reinstalled.

Ziel der Erfindung ist es, einen weiteren elektrischen Baustein der eingangs genannten Art zu schaffen. Es soll insbesondere erreicht werden, daß bei einfachem Aufbau sowohl bei geringeren als auch bei größeren Störungen stets ein zuverlässiger Überspannungsschutz und ein zuverlässiger Schutz vor einer thermischen Überlastung gewährleistet ist, ohne daß hierzu die betreffende Sicherung in jedem Falle erneuert oder repariert werden muß.The aim of the invention is to provide a further electrical module of the type mentioned in the introduction. In particular, it should be achieved that with a simple structure, both with minor and major faults, reliable overvoltage protection and reliable protection against thermal overload is always ensured without the fuse in question having to be renewed or repaired in any case.

Die Aufgabe wird nach der Erfindung dadurch gelöst, daß der PTC-Widerstand über wenigstens ein eine Wärme-Überlast-Sicherung umfassendes Anschlußelement mit dem Stromkreis verbunden ist, wobei die am Substrat oder am PTC-Widerstand fixierbare Wärme-Überlast-Sicherung wenigstens einen Federarm aufweist, der unter Vorspannung mit einer Kontaktstelle des PTC-Widerstandes bzw. des Substrates verlötbar ist.The object is achieved according to the invention in that the PTC resistor is connected to the circuit via at least one connecting element comprising a thermal overload fuse, the thermal overload fuse which can be fixed on the substrate or on the PTC resistor having at least one spring arm which can be soldered under pre-tension to a contact point of the PTC resistor or the substrate.

Aufgrund des erfindungsgemäßen, eine integrierte Wärme-Überlast-Sicherung umfassenden Anschlußelements des PTC-Widerstands sind einerseits der PTC-Widerstand und andererseits aufgrund der Vermeidung einer Brandgefahr infolge einer Zerstörung des PTC-Widerstandes auch das Substrat sowie die auf diesem aufgebrachten Schaltungsteile selbst dann zuverlässig geschützt, wenn ausnahmsweise solch hohe Belastungen auftreten, die normalerweise zu einer völligen Zerstörung des PTC-Widerstands bzw. eines zugeordneten Dickfilmwiderstandes führen würden.Because of the inventive connection element of the PTC resistor, which includes an integrated thermal overload fuse, the PTC resistor on the one hand and the substrate and the circuit parts applied to it on the other hand because of the avoidance of a fire risk due to destruction of the PTC resistor are reliably protected , if exceptionally high loads occur that would normally lead to the complete destruction of the PTC resistor or an associated thick film resistor.

Die insbesondere auch dem Schutz des PTC-Widerstandes dienende Wärme-Überlast-Sicherung ist demnach so auszulegen, daß der PTC-Widerstand einerseits bei extremen Störfällen rechtzeitig, d.h. vor dessen völliger Zerstörung durch Abbrand, stromlos geschaltet wird und andererseits bei solchen Belastungen, die im Hinblick auf eine Zerstörung des Kaltleiters noch unkritisch sind, im normalen Schaltbetrieb arbeiten kann. Hierbei ist insbesondere auch von Vorteil, daß die Wärme-Überlast-Sicherung beispielsweise auf solche Spannungsspitzen, die für den PTC-Widerstand unschädlich sind, nicht anspricht.The thermal overload protection, which also serves in particular to protect the PTC resistor, must therefore be designed in such a way that the PTC resistor on the one hand in the event of extreme accidents, i.e. before it is completely destroyed by erosion, it is switched off and, on the other hand, can operate in normal switching mode under loads which are not critical with regard to destruction of the PTC thermistor. It is particularly advantageous here that the thermal overload fuse does not respond, for example, to those voltage peaks which are harmless to the PTC resistor.

In den Unteransprüchen sind vorteilhafte Ausführungsvarianten der Erfindung angegeben.Advantageous embodiment variants of the invention are specified in the subclaims.

Die Erfindung wird im folgenden anhand eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnung näher erläutert; in dieser zeigt:

Fig. 1
eine schematische Draufsicht auf einen mit einem PTC-Widerstand versehenen Abschnitt eines Dickschichtbausteins, wobei der PTC-Widerstand über das zugeordnete Anschlußelement bereits mit dem betreffenden Stromkreis verbunden ist,
Fig. 2
einen Schnitt entlang der Linie I-I in Fig. 1,
Fig. 3
eine Fig. 2 entsprechende Ansicht der Wärme-Überlast-Sicherung des Anschlußelements, deren kontaktgebender Federarm jedoch noch seine nichtgespannte Ausgangslage einnimmt, und
Fig. 4 bis 6
die einzelnen Schritte zur Herstellung des erfindungsgemäßen Anschlußelements aus einem einheitlichen Stanzteil.
The invention is explained below using an exemplary embodiment with reference to the drawing; in this shows:
Fig. 1
2 shows a schematic plan view of a section of a thick-film module provided with a PTC resistor, the PTC resistor having already been connected to the relevant circuit via the associated connection element,
Fig. 2
2 shows a section along the line II in FIG. 1,
Fig. 3
a Fig. 2 corresponding view of the thermal overload fuse of the connecting element, the contacting spring arm still occupies its non-tensioned starting position, and
4 to 6
the individual steps for producing the connecting element according to the invention from a uniform stamped part.

In den Fig. 1 und 2 ist ein Dickschichtbaustein 10 gezeigt, der mehrere auf einem Substrat 12 angeordnete Schaltungsteile umfaßt, zu denen ein PTC-Widerstand 14 zählt, der über ein Anschlußelement 16 mit einem zugeordneten Stromkreis verbunden ist, der über den PTC-Widerstand 14 in Abhängigkeit von der Temperatur hochohmig bzw. niederohmig schaltbar ist.1 and 2, a thick-film module 10 is shown, which comprises a plurality of circuit parts arranged on a substrate 12, including a PTC resistor 14 which is connected via a connecting element 16 to an associated circuit which is connected via the PTC resistor 14 can be switched as high-resistance or low-resistance depending on the temperature.

Der scheibenförmige PTC-Widerstand 14 ist durch einen elektrisch leitfähigen Silikon-Kleber auf dem Substrat 12 bzw. einer darauf angebrachten Leitfläche fixiert.The disc-shaped PTC resistor 14 is fixed by an electrically conductive silicone adhesive on the substrate 12 or a conductive surface attached to it.

Die vom Substrat 12 abgewandte Stirnfläche des PTC-Widerstandes 14 ist über das Anschlußelement 16 mit dem betreffenden Stromkreis verbunden. Dieses Anschlußelement 16 umfaßt eine integrierte Wärme-Überlast-Sicherung 18 mit einem kontaktgebenden Federarm 28, der im montierten Zustand mit einer Kontaktstelle 30 an einer elektrisch und wärmeleitenden Platte 20 verlötet ist, die im Bereich 72 durch elektrisch leitende Klebung an der betreffenden Stirnfläche des PTC-Widerstandes 14 fixiert ist. Die Wärmeleitplatte 20 erstreckt sich über den seitlichen Rand des scheibenartigen PTC-Widerstandes 14 hinaus und weist am freien Ende dem Substrat 12 zugewandt die Kontaktstelle 30 auf, zwischen der und dem Substrat 12 die Wärme-Überlast-Sicherung 18 angeordnet ist.The end face of the PTC resistor 14 facing away from the substrate 12 is connected to the relevant circuit via the connecting element 16. This connection element 16 comprises an integrated thermal overload fuse 18 with a contact-making spring arm 28, which in the assembled state is soldered to a contact point 30 on an electrically and thermally conductive plate 20, which is in the area 72 by electrically conductive adhesive on the relevant end face of the PTC -Resistor 14 is fixed. The thermal plate 20 extends over the side edge of the disc-like PTC resistor 14 and has at the free end facing the substrate 12, the contact point 30, between which and the substrate 12, the thermal overload fuse 18 is arranged.

Wie insbesondere anhand der Fig. 4 bis 6 zu erkennen ist, besteht das die Wärme-Überlast-Sicherung 18 sowie die Wärmeleitplatte 20 umfassende Anschlußelement 16 zunächst aus einem einheitlichen Stanzteil mit zwei seitlichen Haltestreifen 66, 68, wobei die Wärme-Überlast-Sicherung 18 zunächst noch über einen Steg 74 mit dem Haltestreifen 66 und die Wärmeleitplatte 20 zunächst noch über einen Steg 70 mit dem Haltestreifen 68 verbunden ist.As can be seen in particular from FIGS. 4 to 6, the connecting element 16 comprising the thermal overload fuse 18 and the heat conducting plate 20 initially consists of a uniform stamped part with two lateral holding strips 66, 68, the thermal overload fuse 18 is initially connected to the holding strip 66 via a web 74 and the heat-conducting plate 20 is initially connected to the holding strip 68 via a web 70.

Im Grundaufbau umfaßt die Wärme-Überlast-Sicherung 18 einen im wesentlichen ebenen, U-förmigen Rahmenteil 22, 24, 26 und eine mit dessen Mittelsteg 22 verbundene, den Federarm 28 bildende freiliegende Mittelzunge, die im entspannten Zustand zumindest im wesentlichen in der Rahmenebene liegt (vgl. Fig. 3 und 5).In the basic structure, the thermal overload fuse 18 comprises an essentially flat, U-shaped frame part 22, 24, 26 and an exposed central tongue connected to the central web 22 thereof, which forms the spring arm 28 and which, in the relaxed state, lies at least essentially in the frame plane (see FIGS. 3 and 5).

Der Mittelsteg 22 des über seine beiden Schenkel 24, 26 auf dem Substrat 12 fixierten U-förmigen Rahmenteils 22, 24, 26 weist bei entspanntem Federarm 28 einen geringen Abstand d zum Substrat 12 auf und ist im Bereich 76 des mit ihm verbundenen Federarmes 28 so eingeknickt oder geprägt, daß der Federarm 28 zur Erzielung einer leichten Vorspannung mit seinem freien Ende 36 gegen das Substrat 12 gehalten ist (vgl. Fig.3 und 5). Im gespannten Zustand des Federarmes 28 wird der Mittelsteg 22 dagegen zum Substrat 12 hin gezogen, wie dies beispielsweise in den Figuren 2 und 6 gezeigt ist. In diesem Fall stützt sich der Federarm 28 mit seinem dem Mittelsteg 22 benachbarten Ende 82 flächig auf dem Substrat 12 ab, was durch eine besondere Knicklinie 84 in diesem Bereich des Federarmes erreicht wird (Fig. 2 und 6). Das U-förmige Rahmenteil 22, 24, 26 ist über die in Fig. 1 schraffiert dargestellten Abschnitte seiner beiden Schenkel 24, 26 beispielsweise wiederum mittels eines elektrisch leitenden Klebers auf dem Substrat 12 fixiert.The central web 22 of the U-shaped frame part 22, 24, 26 fixed on the substrate 12 via its two legs 24, 26 has a small distance d from the substrate 12 when the spring arm 28 is relaxed and is in the region 76 of the spring arm 28 connected to it buckled or embossed that the spring arm 28 is held with its free end 36 against the substrate 12 to achieve a slight bias (see. Fig. 3 and 5). In contrast, in the tensioned state of the spring arm 28, the central web 22 is pulled toward the substrate 12, as is shown, for example, in FIGS. 2 and 6. In this case, the spring arm 28 is supported with its end 82 adjacent to the central web 22 flat on the substrate 12, which is achieved by a special fold line 84 in this area of the spring arm (FIGS. 2 and 6). The U-shaped frame part 22, 24, 26 is again, for example, by means of an electrically conductive part of the two legs 24, 26 shown hatched in FIG. 1 Adhesive fixed on the substrate 12.

Der Federarm 28 wird dadurch gespannt, daß dessen freies Ende 36 aus der Rahmenebene heraus nach oben angehoben wird. In diesem gespannten Zustand wird der Federarm 28 zunächst durch zwei Stützarme 32, 34 gehalten, wobei diese Stützarme 32, 34 frühestens nach dem Verlöten des Federarmes 28 mit der Kontaktstelle 30 der Wärmeleitplatte 20 , vorzugsweise jedoch erst nach erfolgter Montage des Anschlußelements 16 auf dem Substrat 12 sowie am PTC-Widerstand 14, wieder von dem Federarm 28 entfernt werden, wie dies in Fig. 2 durch die gestrichelte Darstellung 34' des einen Stützarmes angedeutet ist.The spring arm 28 is tensioned in that its free end 36 is lifted up out of the frame plane. In this tensioned state, the spring arm 28 is initially held by two support arms 32, 34, these support arms 32, 34 at the earliest after the spring arm 28 has been soldered to the contact point 30 of the heat-conducting plate 20, but preferably only after the connection element 16 has been mounted on the substrate 12 as well as on the PTC resistor 14 can be removed from the spring arm 28 again, as is indicated in FIG. 2 by the broken line 34 'of the one support arm.

Beim beschriebenen Ausführungsbeispiel sind die beiden Stützarme 32, 34 an den freien Enden der beiden Schenkel 24, 26 des U-förmigen Rahmenteils 22, 24, 26 vorgesehen und jeweils um eine querverlaufende Kerblinie 50 bzw. 52 zur Abstützung des Federarmes 28 in dessen gespannter Lage nach oben abbiegbar. Nach dem Verlöten des Federarmes 28 mit der Kontaktstelle 30 der Wärmeleitplatte 20 bzw. nach der endgültigen Montage des Anschlußelements 16 auf dem Substrat 12 und am PTC-Widerstand 14 sind die Stützarme 32, 34 vorzugsweise an diesen Kerblinien 50, 52 beispielsweise durch mehrmaliges Umbiegen von den Schenkeln 24, 26 des U-förmigen Rahmens 22, 24, 26 abtrennbar. Die Wärme-Überlast-Sicherung 18 ist jedoch bereits betriebsbereit, sobald das freie Ende 36 des Federarmes 28 von den Stützarmen 32, 34 freigegeben wird und der gespannte Federarm 28 lediglich noch über die betreffende Lötstelle an der Wärmeleitplatte 20 gehalten wird.In the exemplary embodiment described, the two support arms 32, 34 are provided on the free ends of the two legs 24, 26 of the U-shaped frame part 22, 24, 26 and each have a transverse score line 50 or 52 for supporting the spring arm 28 in its tensioned position bendable upwards. After soldering the spring arm 28 to the contact point 30 of the heat-conducting plate 20 or after the final assembly of the connection element 16 on the substrate 12 and on the PTC resistor 14, the support arms 32, 34 are preferably on these score lines 50, 52, for example by repeated bending of the legs 24, 26 of the U-shaped frame 22, 24, 26 separable. However, the thermal overload fuse 18 is already ready for operation as soon as the free end 36 of the spring arm 28 is released by the support arms 32, 34 and the tensioned spring arm 28 is only held on the heat-conducting plate 20 via the relevant solder joint.

Um die Abstützung des Federarmes 28 durch die Stützarme 32, 34 zu ermöglichen, weist dieser zweckmäßigerweise einen seitlich verbreiterten, mit einer Sicke 40 oder dergl. versehenen Abschnitt 42 auf, in dessen Mulde 44 bei über die Stützarme 32, 34 gespanntem Federarm 28 seitlich an den Stützarmen 32, 34 vorspringende Stützlaschen 46, 48 eingreifen (vgl. insbesondere Fig. 2 und 4 bis 6).In order to enable the spring arm 28 to be supported by the support arms 32, 34, it expediently has a laterally widened section 42 provided with a bead 40 or the like, in the recess 44 of which laterally with the spring arm 28 stretched over the support arms 32, 34 engage the support arms 32, 34 projecting support tabs 46, 48 (see. In particular Fig. 2 and 4 to 6).

Wie insbesondere anhand der Fig. 2, 5 und 6 zu erkennen ist, ist das freie Ende 36 des Federarmes 28 derart umgebogen, daß dieses bei gespanntem Federarm 28 flächig an der zugeordneten Kontaktstelle 30 der Wärmeleitplatte 20 anliegt.As can be seen in particular from FIGS. 2, 5 and 6, the free end 36 of the spring arm 28 is bent in such a way that it rests flat against the associated contact point 30 of the heat-conducting plate 20 when the spring arm 28 is tensioned.

Die nicht zu verbiegenden oder nicht zu knickenden Teile des die Wärme-Überlast-Sicherung 18 sowie die Wärmeleitplatte 20 umfassenden Anschlußelements 16 sind zumindest teilweise mit Versteifungselementen 54 - 64 in Form von Prägungen und/oder seitlich abgewinkelten Versteifungswänden versehen. So weisen beispielsweise die Schenkel 24, 26 des U-förmigen Rahmenteils 22, 24, 26 an den am Substrat 12 fixierten Abschnitten an den innenliegenden Längsseiten nach oben gebogene Versteifungswände 58, 60 auf. Demgegenüber sind die Stützarme 32,34 mit längsgerichteten Versteifungsnuten 54, 56 in Form von Prägungen versehen.The parts of the connecting element 16 comprising the thermal overload fuse 18 and the heat-conducting plate 20 that are not to be bent or bent are at least partially provided with stiffening elements 54-64 in the form of embossments and / or laterally angled stiffening walls. For example, the legs 24, 26 of the U-shaped frame part 22, 24, 26 have stiffening walls 58, 60 bent upwards on the sections fixed to the substrate 12 on the inner longitudinal sides. In contrast, the support arms 32, 34 are provided with longitudinal stiffening grooves 54, 56 in the form of embossments.

Die Wärmeleitplatte 20 weist gemäß den Fig. 1 und 4 drei längsgerichtete 62 sowie im Bereich des Stegs 70 ein querverlaufendes Versteifungselement 64 auf, die wiederum durch Versteifungsnuten in Form von Prägungen erhalten wurden.1 and 4, the heat-conducting plate 20 has three longitudinal 62 and, in the area of the web 70, a transverse stiffening element 64, which in turn was obtained by stiffening grooves in the form of embossments.

Das U-förmige Rahmenteil 22, 24, 26, der Federarm 28, die Stützarme 32, 34 sowie die Wärmeleitplatte 20 sind zweckmäßigerweise aus gebürsteter Federbronze hergestellt und matt vernickelt sowie in den in Fig. 4 punktiert dargestellten Bereichen verzinnt.The U-shaped frame part 22, 24, 26, the spring arm 28, the support arms 32, 34 and the heat-conducting plate 20 are expediently made of brushed spring bronze and are nickel-plated in matt and tin-plated in the areas shown in dotted lines in FIG. 4.

Die einzelnen Schritte zur Herstellung des die Wärme-Überlast-Sicherung 18 sowie die Wärmeleitplatte 20 umfassenden Anschlußelements 16 aus einem einzigen Stanzteil ergeben sich aus den Fig. 4 bis 6, wobei nach dem Formstanzen und Prägen sowie dem Trennen der Wärme-Überlast-Sicherung von der Wärmeleitplatte (Fig. 4) der als Kontaktzunge dienende Federarm 28 geformt, die zu dessen Abstützung dienende Sicke 40 ausgebildet sowie die zur Erzeugung einer leichten Vorspannung dienende Prägung 76 vorgenommen werden (Fig. 5).The individual steps for producing the connecting element 16 comprising the thermal overload fuse 18 and the heat conducting plate 20 from a single stamped part result from FIGS. 4 to 6, after the stamping and embossing and the separation of the thermal overload fuse from the heat-conducting plate (FIG. 4), the spring arm 28 serving as a contact tongue is formed, the bead 40 serving to support it is formed, and the embossing 76 used to produce a slight pretension is carried out (FIG. 5).

Ferner wird in einem Bereich 78 an der Unterseite des Stanzteils eine Lotschicht aufgebracht.Furthermore, a solder layer is applied in an area 78 on the underside of the stamped part.

Gemäß Fig. 6 wird anschließend das die Wärmeleitplatte 20 aufweisende linke Stanzteil im Bereich der beiden Enden des Steges 70 so abgewinkelt, daß die Wärmeleitplatte 20 einen Abstand D zum zu dieser wiederum parallelen Haltestreifen 68 aufweist, der zumindest im wesentlichen gleich der Höhe des auf dem Substrat 12 aufzubringenden PTC-Widerstandes 14 ist. Ferner wird der Federarm 28 gespannt sowie durch die nach oben gebogenen Stützarme 32, 34 in der gespannten Lage gehalten. Danach werden die Wärmeleitplatte 20 sowie die Wärme-Überlast-Sicherung 18 zusammengefügt und an der Kontaktstelle 30 miteinander verlötet. Die auf diese Weise erhaltenen Anschlußelemente bilden somit eine gegurtete Anordnung. Vor einer entsprechenden Bestückung des jeweiligen Substrats beispielsweise mittels eines Bestückungsautomaten werden schließlich die Haltestreifen 66, 68 abgetrennt. Während der Montage wird das Anschlußelement vorzugsweise in einem Bereich 80 der Wärmeleitplatte 20 (Fig. 1) vom Bestückungswerkzeug erfaßt und auf das Substrat 12 bzw. den PTC-Widerstand aufgesetzt. Schließlich werden die Stützarme 32, 34 von der Kontaktstelle 30 weg nach unten gebogen, wie dies in Fig. 2 beispielsweise anhand des strichliniert dargestellten Stützarmes 34' angedeutet ist, und vorzugsweise durch mehrmaliges Umbiegen an den Kerblinien 50, 52 von den Schenkeln 24, 26 abgetrennt (Fig. 4).According to FIG. 6, the left stamped part having the heat-conducting plate 20 is then angled in the region of the two ends of the web 70 in such a way that the heat-conducting plate 20 is at a distance D from the holding strip 68, which is parallel to the latter and which is at least substantially equal to the height of the on the Substrate 12 to be applied PTC resistor 14 is. Furthermore, the spring arm 28 is tensioned and held in the tensioned position by the upwardly bent support arms 32, 34. Thereafter, the heat conducting plate 20 and the thermal overload fuse 18 are joined together and soldered to one another at the contact point 30. The connection elements obtained in this way thus form a taped arrangement. Finally, the holding strips 66, 68 are separated before the respective substrate is appropriately equipped, for example by means of an automatic placement machine. During assembly, the connection element is preferably gripped in an area 80 of the heat-conducting plate 20 (FIG. 1) by the insertion tool and placed on the substrate 12 or the PTC resistor. Finally, the support arms 32, 34 are bent downward away from the contact point 30, as is indicated in FIG. 2, for example, with the aid of the support arm 34 'shown in broken lines, and preferably by repeated bending on the score lines 50, 52 from the legs 24, 26 separated (Fig. 4).

Im übrigen kann der Dickschichtbaustein 10 insbesondere so ausgelegt sein, wie dies in der DE 41 43 095 angegeben ist.For the rest, the thick-film module 10 can in particular be designed as specified in DE 41 43 095.

Claims (12)

Elektrischer Baustein mit auf einem Substrat (12) oder dergl. angeordneten Schaltungsteilen, die wenigstens einen PTC-Widerstand (14) umfassen, über den ein zugeordneter Stromkreis in Abhängigkeit von der Temperatur hochohmig bzw. niederohmig schaltbar ist,
dadurch gekennzeichnet,
daß der PTC-Widerstand (14) über wenigstens ein eine Wärme-Überlast-Sicherung (18) umfassendes Anschlußelement (16) mit dem Stromkreis verbunden ist, wobei die am Substrat (12) oder am PTC-Widerstand (14) fixierbare Wärme-Überlast-Sicherung (18) wenigstens einen Federarm (28) aufweist, der unter Vorspannung mit einer Kontaktstelle (30) des PTC-Widerstandes (14) bzw. des Substrates (12) verlötbar ist.Electrical component with circuit parts arranged on a substrate (12) or the like, which comprise at least one PTC resistor (14), via which an assigned circuit can be switched with high or low resistance depending on the temperature,
characterized,
that the PTC resistor (14) is connected to the circuit via at least one connecting element (16) comprising a thermal overload fuse (18), the thermal overload which can be fixed on the substrate (12) or on the PTC resistor (14) - Fuse (18) has at least one spring arm (28) which can be soldered under pretension to a contact point (30) of the PTC resistor (14) or the substrate (12). Elektrischer Baustein nach Anspruch 1, dadurch gekennzeichnet, daß der Federarm (28) an einem zumindest im wesentlichen ebenen Rahmenteil (24, 26, 28) des Anschlußelements (16) befestigt ist und im entspannten Zustand zumindest im wesentlichen in der Rahmenebene liegt, und daß der Federarm (28) durch wenigstens einen Stützarm (32, 34) im gespannten Zustand gehalten ist, wobei der Stützarm (32, 34) frühestens nach dem Verlöten des Federarmes (28) mit der Kontaktstelle (30) wieder vom Federarm (28) entfernbar ist.Electrical module according to Claim 1, characterized in that the spring arm (28) is fastened to an at least substantially flat frame part (24, 26, 28) of the connecting element (16) and, in the relaxed state, lies at least essentially in the frame plane, and in that the spring arm (28) is held in the tensioned state by at least one support arm (32, 34), the support arm (32, 34) being removable from the spring arm (28) at the earliest after the spring arm (28) has been soldered to the contact point (30) is. Elektrischer Baustein nach Anspruch 2, dadurch gekennzeichnet, daß das vorzugsweise am Substrat (12) fixierbare Rahmenteil (22, 24, 26) U-förmig ausgebildet ist und eine mit dessen Mittelsteg (22) verbundene, den Federarm (28) bildende freiliegende Mittelzunge umfaßt.Electrical module according to Claim 2, characterized in that the frame part (22, 24, 26) which can preferably be fixed on the substrate (12) is U-shaped and comprises an exposed central tongue which forms the spring arm (28) and is connected to the central web (22) thereof . Elektrischer Baustein nach Anspruch 3, dadurch gekennzeichnet, daß der Mittelsteg (22) des über seine beiden Schenkel (24, 26) auf dem Substrat (12) fixierten U-förmigen Rahmenteils (22, 24, 26) bei entspanntem Federarm (28) einen geringen Abstand (d) zum Substrat (12) aufweist und im Bereich des mit ihm verbundenen Federarmes (28) so eingeknickt oder geprägt (76) ist, daß der Federarm (28) zur Erzielung einer leichten Vorspannung mit seinem freien Ende (36) gegen das Substrat (12) gehalten ist.Electrical module according to Claim 3, characterized in that the central web (22) is fixed on the substrate (12) via its two legs (24, 26) U-shaped frame part (22, 24, 26) when the spring arm (28) is relaxed is at a short distance (d) from the substrate (12) and is bent or embossed (76) in the area of the spring arm (28) connected to it so that the spring arm (28) is held with its free end (36) against the substrate (12) in order to achieve a slight pretension. Elektrischer Baustein nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß an den freien Enden der Schenkel (24, 26) des U-förmigen Rahmenteils (22, 24, 26) jeweils ein mit dem betreffenden Schenkel (24, 26) verbundener, in Richtung der Kontaktstelle (30) abbiegbarer Stützarm (32, 34) vorgesehen ist.Electrical module according to one of the preceding claims, characterized in that at the free ends of the legs (24, 26) of the U-shaped frame part (22, 24, 26) in each case one connected to the relevant leg (24, 26) in the direction the contact point (30) bendable support arm (32, 34) is provided. Elektrischer Baustein nach Anspruch 5, dadurch gekennzeichnet, daß der Federarm (28) einen seitlich verbreiterten, mit einer Sicke (40) oder dergl. versehenen Abschnitt (42) aufweist, in dessen Mulde (44) bei über die Stützarme (32, 34) gespanntem Federarm (28) seitlich an den Stützarmen (32, 34) vorspringende Stützlaschen (46, 48) eingreifen.Electrical module according to Claim 5, characterized in that the spring arm (28) has a laterally widened section (42) provided with a bead (40) or the like, in the trough (44) of which via the support arms (32, 34) engage tensioned spring arm (28) on the side of the support arms (32, 34) projecting support tabs (46, 48). Elektrischer Baustein nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das freie Ende (36) des Federarmes (28) derart umgebogen ist, daß dieses bei gespanntem Federarm (28) flächig an der zugeordneten Kontaktstelle (30) anliegt.Electrical module according to one of the preceding claims, characterized in that the free end (36) of the spring arm (28) is bent over in such a way that when the spring arm (28) is tensioned it lies flat against the associated contact point (30). Elektrischer Baustein nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Stützarme (32, 34) jeweils über eine Kerblinie (50, 52) mit dem Rahmenteil (22, 24, 26) verbunden sind.Electrical module according to one of the preceding claims, characterized in that the support arms (32, 34) are each connected to the frame part (22, 24, 26) via a score line (50, 52). Elektrischer Baustein nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Kontaktstelle (30) an einer mit dem PTC-Widerstand (14) verbindbaren Wärmeleitplatte (20) vorgesehen ist, während das den Federarm (28) aufweisende Rahmenteil (22, 24, 26) am Substrat (12) fixiert ist.Electrical module according to one of the preceding claims, characterized in that the contact point (30) is provided on a heat-conducting plate (20) which can be connected to the PTC resistor (14), while the Frame part (22, 24, 26) having spring arm (28) is fixed to the substrate (12). Elektrischer Baustein nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die nicht zu verbiegenden oder nicht zu knickenden Teile des Anschlußelements (16) zumindest teilweise mit Versteifungselementen (54 - 64), insbesondere mit Versteifungsnuten in Form von Prägungen und/oder seitlich abgewinkelten Versteifungswänden versehen sind.Electrical module according to one of the preceding claims, characterized in that the parts of the connecting element (16) which are not to be bent or not to be bent are at least partially provided with stiffening elements (54-64), in particular with stiffening grooves in the form of embossments and / or laterally angled stiffening walls are. Elektrischer Baustein nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Rahmenteil (22, 24, 26), der Federarm (28), die Stützarme (32, 34) und/oder die Wärmeleitplatte (20) aus Federbronze hergestellt und zumindest abschnittsweise galvanisch vernickelt und verzinnt sind.Electrical module according to one of the preceding claims, characterized in that the frame part (22, 24, 26), the spring arm (28), the support arms (32, 34) and / or the heat conducting plate (20) are made of spring bronze and are at least partially galvanically are nickel-plated and tinned. Elektrischer Baustein nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Rahmenteil (22, 24, 26), der Federarm (28), die Stützarme (32, 34) und die Wärmeleitplatte (20) zunächst als einheitliches Stanzteil ausgebildet sind.Electrical module according to one of the preceding claims, characterized in that the frame part (22, 24, 26), the spring arm (28), the support arms (32, 34) and the heat-conducting plate (20) are initially designed as a uniform stamped part.
EP93108813A 1992-06-12 1993-06-01 Electrical unit Expired - Lifetime EP0575783B1 (en)

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DE4219304A DE4219304C2 (en) 1992-06-12 1992-06-12 Reliable overcurrent protection component with a small footprint and simple construction
DE4219304 1992-06-12

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WO1995035577A2 (en) * 1994-06-22 1995-12-28 Littelfuse, Inc. Improved dual element circuit protection device
WO1995035577A3 (en) * 1994-06-22 1996-03-28 Littelfuse Inc Improved dual element circuit protection device
US5907272A (en) * 1996-01-22 1999-05-25 Littelfuse, Inc. Surface mountable electrical device comprising a PTC element and a fusible link
FR2926394A1 (en) * 2008-01-10 2009-07-17 Seb Sa Thermal safety device for heating element i.e. heating base, arranged on substrate forming heating sub-assembly of liquid heating apparatus, has lever generating tilting moment of one of two zones around point arranged between two zones
WO2009112658A2 (en) * 2008-01-10 2009-09-17 Seb S.A. Thermal safety device
WO2009112658A3 (en) * 2008-01-10 2009-11-05 Seb S.A. Thermal safety device
CN101911237B (en) * 2008-01-10 2013-03-20 Seb公司 Thermal safety device
WO2014025740A1 (en) * 2012-08-06 2014-02-13 Tyco Electronics Corporation Reflowable circuit protection device
CN104520956A (en) * 2012-08-06 2015-04-15 泰科电子公司 Reflowable circuit protection device
US9431203B2 (en) 2012-08-06 2016-08-30 Littelfuse, Inc. Reflowable circuit protection device
CN104520956B (en) * 2012-08-06 2016-10-19 泰科电子公司 Can melt back welding circuit protection device
WO2015007911A1 (en) * 2013-07-19 2015-01-22 Phoenix Contact Gmbh & Co.Kg Over-voltage protection device for limited installation space

Also Published As

Publication number Publication date
EP0575783B1 (en) 1997-03-19
DE4219304A1 (en) 1993-12-23
US5363083A (en) 1994-11-08
DE4219304C2 (en) 1994-03-31
DE59305839D1 (en) 1997-04-24
ES2098592T3 (en) 1997-05-01

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